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	<title>Document</title>
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	// prompt('输入你的密码');
	// Document.write('<h1>我是用js写入进来来的</h1>');不能大写
	 document.write('<h1>我是用js写入进来的</h1>');
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<body>
	<!-- <h1>我还是h1标签</h1> -->
</body>
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